Nigerian lightweight boxer Cynthia Ogunsemilore has been suspended on Saturday after she tested positive for a banned substance ahead of her opening fight at the Paris Olympics.

The 22-year-old African Games champion tested positive for the diuretic furosemide in a sample taken on Thursday, the ITA said. Furosemide is a masking agent that can hide the presence of other drugs.

“The athlete has been informed of the case and has been provisionally suspended until the resolution of the matter in line with the World Anti-Doping Code and the International Olympic Committee Anti-Doping Rules,” the ITA stated.

“This means that the athlete is prevented from competing, training, coaching, or participating in any activity, during the Olympic Games Paris 2024.”

“The athlete has the right to challenge the imposition of the provisional suspension before the Court of Arbitration for Sport – Anti-Doping Division. The athlete also has the right to request the analysis of the B-sample.”

The Commonwealth Games bronze medalist was scheduled to compete on Monday in the round of 16 as the fourth-seeded boxer in the women’s 60-kilogram (132-pound) class.